Airplane hangar door



Nov. 3, 1931. D. GREENWALD AIRPLANE HANGAR DOOR Filed Sept. 22, 1930 w 5&5 .RS

I PatentedjNov. 3,119.31'.

Ig UN-ITED ST1A 'rss 'PATENT .osi-ics;

This invention relates todoorsiforliangars,

`f or airplanes,`

For manufacturing v'buildin I zep lins, balloons or similar vehicles. -In

suc structures the entrances are vrequired to 5 b e very I ar wide, high', and unobstructed, ,'and hereto ore the doors utilized for openand closing such entrances ywere ineiliadvantages. I Thev principal object of the invention is to provide doors `for-the above mentioned purpose, which ma be conveniently andv economically instal ed, wherewith entrances of any required width and height'nia be readily, rapidl and conveniently c osed and o ned wit out any obstruction, which e ciently V'resist 'any Wind pressure or .dislocation, and which will be strong, durable, ecient, and improved. 1 "2 'Other objects and advantages will hereinafter appear. In the 'accompanying drawings,-v Fig. `1 shows an lelevation ofa portion of a building'equipped with the doors constitutinv the invention, the remainder of the building and improvements not being shown for convenience of illustration.

` Fig. 2 is a transverse-sectional vside elevation of the doors shown in Fig. 1. v

Fig. 3 is a view similar to that shown in Fig. 2, but showing the doorsin opened stata l A. i i- Fig. 4 is a plan view,.in a'n" enlargedsale, showing a detail ofthe invention.

At each side 'of .the largeopening 1 ofthe building\2 isprovideda vertical guiding- ,cient and embodied many 'well known disyiii way 3, ,andv between said 'guidingwvay's is ing.

closer'the upperareaway in'a similarmanf I ner. The door-sections 6 are slidable in chan# guiding-ways 3 are vertically slidab e therein. The door-sections 6 are normally maintained in elevated state to close the upper areaway of opening 1, as 'shown in Figs. L, 2, by means of h a ers 8 thereof restin upon brackets 9 secure to the buildslidable, from a lowermost position shown in Figs. 1, 2 to an elevated position shown in Fig. 3, in guiding-wa s 10 secured to the building-frame 2, in t e manner shown in Fig. 4, and when the mullions gare in lowered position their terminals 11 rest within cavnels 7 Fig; 4, of their respective mullions, 1 while the ends of the Adoor-sections 6 1odgin in the h of the mullions 4 is vertically ities 12 forined in boxes- 13 sunk in the floor 14 of the building. To each door-section 5 are secured several cables 15, each of-which is carried around a pulley 16 running in brackets `17 secured to the building-frame, 'and from said ulley7 the cable extends to a' sheave 18 to w 'ch it 'issecuredland wound around. The sheaves- 18 are in turn keyed upon a shaft 19` which is rotatable in bearings, not shown, mounted inthe side-walls 20 4of the building 2. At each end of 'shft 19 is keyed a drum 21 around which is wound located a series of-mullionsl.` Between eachof said lion an between each adJoiningpaiiof said mullions is located indoor-section 5, all of ding-ways and its adjoining inul-v a Acable 22having` toits terminal secured a counterweight- 23, for counterbalancing the door-sections 5,6 and vertically slidable mullions 4. About the shaft 19 vand near each drinn. 21 is mounteda hoisting device 24 joined to a bracket. 25 secured to' the build-v mg-frame, which,device is operable by the usual hoistin chain 26. Uponv operation of either or bot of the hoisting chains 26, the

shaft 19 isrotated and the drums 18 are which sections' ae intended to normally close the lower areawaliy of the opening-1,.as.shown in Figs. 1, 2. cured to the mullions 4, while the ends offihe l door-sectionslodin'g in the guidin -w'ays l3 are vertically sli areawayof theopening 1 is` located a series .of door-sections 6, which ,arel similar to the 5 door-sections 5 and are intended to normally he door-sections 5 are vse"-l able'therein. In t e upper.

.doorsectionsf 6 vand elevate the latter to the- Fig. 3, whereby the en- `tire areaway of the large openin 1 ofthe vwound up to ,simultaneously elevate all of the counterbalanced door-sections 5 and the mullions 4, to which they are secured, from the 1 position shown in Figs; 1, 2`to that shown in. ig'. 3.l In the aseendency of the doorsections 5, vprojections 27 thereof enga the position shown. in

building isV cleared of all doors an inullions and rendered suitable 'for eiiicient entrance and egress of airships. 4Upon the doors 5, 6 reaching their full ascendency, rojections 28 secured to the bottoms of the` oors 6 strike lthe brackets 9 and therebylimit Vthe upward movement, as shown in Fig. 3. When it is desired toclose the openin 110i the building, the same `isaccomplished merely operating thehoisting chain 26 backwardly. Insome situations the mullions 4 ma project lo above the roof 29 of the building w en full elevated, as illustrated in Fig. 3, and in suc A cases a hinged shutter '30 may be p'rovided above each mullionl in the roof 29, which shutter will automatically open up by the maybe indefinitely multiplied to provide forv an widt and height .of opening of theI building, to. completely open and clear the latter of any obstruction oreicient'use of the building, and that the retention of the mullions in the -ways 10 and ground boxes 13 will e cient y maintain the door closure against any wind pressure or other dislocation. 4

. Variations may be resorted to within the scope of the invention, and ortions of the. im rovements ma be usedwithoutothers. c1 aving thus escribed my invention, I

aimz- 35 1. A hangarclosure comprising ja. plural-- ity of. vertical mullions adapted to slide vertically, vertical means for said mullions, a plurality of oor sections between each adjoining pair-of said mullions being o arranged at various lelevations to close the area between said air of mullions, the low# ermost of said sections being secured to l/said a mullions, the uppermost of said sectionsbeing in suspension, means'to elevate saidv low- A 46 ermost door-sections and mullions, and said 'f lowermost sections'. raising said remaining 'sections'therewithwhen ascending. 2. A hangar closure comprising a pluralityof -`vertical mullions-adapted to slide veren tically, vertical guidin Ameans forgsaid muloor sections between lions, a plurality of raising of the mullion and will close up by.

said arranged at various elevations to close the areas about said mullion,

the lowermost o f 'said sections adapted to be Y elevated together with said mullion, and said Vremaining sections being 4elevated with the levation of said lowermost sections and mulion.

to close the areas about said mullion, the low.

ermost of said sections adapted to be elevated together with said mullion, said. remaining sections being elevated with the ele'- .vation of said lowermost sections and mulbe evident in this invention that.

lion, and means at the ground engaging said mullion upon its descent.

V5. A hangar closure 'comprising al lurality of vertical mullions adapted to sli c ver! tically2 guiding means for said mullions, av

plurahty of door sections'between each adjoining pair of said mullions'` being arran `ed at various elevations tolose the area Jetween said pair of mullions,'the lowermost of said sections adapted to 4be elevated together with said mullions, and the uppermost 4. A hangar closure comprising a vertical i -of said. sections being slidable in said miileach adjoiningpair o f said mullions'being l arranged at various elevationstoclose the lions andv adaptedtdbe elevated with the elevation' of -said mullions and loweimost sectiona` 16. A hangar closure comprising a plural` ity of vertical mullions adapted to slide ,verftically2 guiding means for said mullions, a.l

plurality of door sections betweeneach ad. joining pair of said mullions being arranged at various elevations to close the area be'-A tween said pair of mullions, the lowermost of said sections adapted to be elevated together lwith said mullions,'A the uppermost of said sections being slidable in said mullions and t ted to be elevatedwith the elevation of da said? mullions'and lowermost sections, and means at the ground lfor engaging each of said mullions n its descent.

Signed at t e city of New York, in the* county of New York, and State of New York, this 20th day of September. A. D. 1930.

DAVE) area between said pair of mullions, the low- 55,' ermost of said. sections being secured to'said mullions, theuppermost of said sections'be-4 ing in ysuspension, means .to elevate said lowermost door-sections and mullions, said low`- ermostsection s raising said remaining sec Q0 vtions therewith when. ascending, and means at the ground for engaging each of said mul-Y nlions upon its descent.

l25. -A hangar closure-comprising a vertical mullion adapted 'to slide vertically, a` plural- .je of door-sections. adjacent each side of iol 

